/* $Id: s_copypix.c,v 1.4 2000/11/10 18:29:18 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "convolve.h"
#include "feedback.h"
#include "macros.h"
#include "mem.h"
#include "mmath.h"
#include "pixel.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_histogram.h"
#include "s_pixeltex.h"
#include "s_span.h"
#include "s_stencil.h"
#include "s_texture.h"
#include "s_zoom.h"
/*
* Determine if there's overlap in an image copy
*/
static GLboolean
regions_overlap(int srcx, int srcy, int dstx, int dsty, int width, int height,
float zoomX, float zoomY)
{
if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
return GL_FALSE;
}
else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
return GL_FALSE;
}
else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
return GL_FALSE;
}
else {
return GL_TRUE;
}
}
/*
* RGBA copypixels with convolution.
*/
static void
copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
GLdepth zspan[MAX_WIDTH];
GLboolean quick_draw;
GLint row;
GLboolean changeBuffer;
GLchan *saveReadAlpha;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLuint transferOps = ctx->_ImageTransferState;
GLfloat *dest, *tmpImage, *convImage;
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLdepth z = (GLdepth)
(ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
GLint i;
for (i = 0; i < width; i++) {
zspan[i] = z;
}
}
if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
&& !zoom
&& destx >= 0
&& destx + width <= ctx->DrawBuffer->Width) {
quick_draw = GL_TRUE;
}
else {
quick_draw = GL_FALSE;
}
/* If read and draw buffer are different we must do buffer switching */
saveReadAlpha = ctx->ReadBuffer->Alpha;
changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
|| ctx->DrawBuffer != ctx->ReadBuffer;
/* allocate space for GLfloat image */
tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
FREE(tmpImage);
gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
dest = tmpImage;
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
else
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
}
/* read source image */
dest = tmpImage;
for (row = 0; row < height; row++) {
GLchan rgba[MAX_WIDTH][4];
GLint i;
gl_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
/* convert GLchan to GLfloat */
for (i = 0; i < width; i++) {
*dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
*dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
*dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
*dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
}
}
/* read from the draw buffer again (in case of blending) */
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
ctx->Color.DriverDrawBuffer );
ctx->ReadBuffer->Alpha = saveReadAlpha;
}
/* do image transfer ops up until convolution */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
/* scale & bias */
if (transferOps & IMAGE_SCALE_BIAS_BIT) {
_mesa_scale_and_bias_rgba(ctx, width, rgba);
}
/* color map lookup */
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_rgba(ctx, width, rgba);
}
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->ColorTable, width, rgba);
}
}
/* do convolution */
if (ctx->Pixel.Convolution2DEnabled) {
_mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
}
else {
ASSERT(ctx->Pixel.Separable2DEnabled);
_mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
}
FREE(tmpImage);
/* do remaining image transfer ops */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
}
/* color matrix */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
_mesa_transform_rgba(ctx, width, rgba);
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
_mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
}
/* update min/max */
if (transferOps & IMAGE_MIN_MAX_BIT) {
_mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
}
}
for (row = 0; row < height; row++) {
const GLfloat *src = convImage + row * width * 4;
GLchan rgba[MAX_WIDTH][4];
GLint i, dy;
/* clamp to [0,1] and convert float back to chan */
for (i = 0; i < width; i++) {
GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
}
if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
GLchan primary_rgba[MAX_WIDTH][4];
GLuint unit;
/* XXX not sure how multitexture is supposed to work here */
MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
_mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
s, t, r, q);
gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
primary_rgba, rgba);
}
}
/* write row to framebuffer */
dy = desty + row;
if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
(*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
(const GLchan (*)[4])rgba, NULL );
}
else if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
(const GLchan (*)[4])rgba, desty);
}
else {
gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
}
}
FREE(convImage);
}
/*
* RGBA copypixels
*/
static void
copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
GLdepth zspan[MAX_WIDTH];
GLchan rgba[MAX_WIDTH][4];
GLchan *tmpImage,*p;
GLboolean quick_draw;
GLint sy, dy, stepy;
GLint i, j;
GLboolean changeBuffer;
GLchan *saveReadAlpha;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
const GLuint transferOps = ctx->_ImageTransferState;
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
return;
}
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
for (i=0;i<width;i++) {
zspan[i] = z;
}
}
if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
&& !zoom
&& destx >= 0
&& destx + width <= ctx->DrawBuffer->Width) {
quick_draw = GL_TRUE;
}
else {
quick_draw = GL_FALSE;
}
/* If read and draw buffer are different we must do buffer switching */
saveReadAlpha = ctx->ReadBuffer->Alpha;
changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
|| ctx->DrawBuffer != ctx->ReadBuffer;
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
if (!tmpImage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
else
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
}
for (j = 0; j < height; j++, ssy += stepy) {
gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
(GLchan (*)[4]) p );
p += (width * sizeof(GLchan) * 4);
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warnings */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
/* Get source pixels */
if (overlapping) {
/* get from buffered image */
MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
p += (width * sizeof(GLchan) * 4);
}
else {
/* get from framebuffer */
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
}
else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
}
else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
}
else {
ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
}
}
gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
}
if (changeBuffer) {
/* read from the draw buffer again (in case of blending) */
(*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
ctx->Color.DriverDrawBuffer );
ctx->ReadBuffer->Alpha = saveReadAlpha;
}
if (transferOps) {
const GLfloat scale = (1.0F / CHAN_MAXF);
GLfloat rgbaFloat[MAX_WIDTH][4];
GLuint k;
/* convert chan to float */
for (k = 0; k < width; k++) {
rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
}
/* scale & bias */
if (transferOps & IMAGE_SCALE_BIAS_BIT) {
_mesa_scale_and_bias_rgba(ctx, width, rgbaFloat);
}
/* color map lookup */
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_rgba(ctx, width, rgbaFloat);
}
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
}
/* convolution */
if (transferOps & IMAGE_CONVOLUTION_BIT) {
/* XXX to do */
}
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
}
/* color matrix */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
_mesa_transform_rgba(ctx, width, rgbaFloat);
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
_mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
}
/* update min/max */
if (transferOps & IMAGE_MIN_MAX_BIT) {
_mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
}
/* clamp to [0,1] and convert float back to chan */
for (k = 0; k < width; k++) {
GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
}
}
if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
GLchan primary_rgba[MAX_WIDTH][4];
GLuint unit;
/* XXX not sure how multitexture is supposed to work here */
MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
_mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
s, t, r, q);
gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
primary_rgba, rgba);
}
}
if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
(*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy,
(const GLchan (*)[4])rgba, NULL );
}
else if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
(const GLchan (*)[4])rgba, desty);
}
else {
gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
}
}
/* Restore pixel source to be the draw buffer (for blending, etc) */
(*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
ctx->Color.DriverDrawBuffer );
if (overlapping)
FREE(tmpImage);
}
static void copy_ci_pixels( GLcontext *ctx,
GLint srcx, GLint srcy, GLint width, GLint height,
GLint destx, GLint desty )
{
GLdepth zspan[MAX_WIDTH];
GLuint *tmpImage,*p;
GLint sy, dy, stepy;
GLint i, j;
GLboolean changeBuffer;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
GLint overlapping;
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (ctx->Depth.Test || ctx->Fog.Enabled) {
/* fill in array of z values */
GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
for (i=0;i<width;i++) {
zspan[i] = z;
}
}
/* If read and draw buffer are different we must do buffer switching */
changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
|| ctx->DrawBuffer != ctx->ReadBuffer;
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
if (!tmpImage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
}
for (j = 0; j < height; j++, ssy += stepy) {
gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, ssy, p );
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
GLuint indexes[MAX_WIDTH];
if (overlapping) {
MEMCPY(indexes, p, width * sizeof(GLuint));
p += width;
}
else {
if (changeBuffer) {
(*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
ctx->Pixel.DriverReadBuffer );
}
gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
}
if (changeBuffer) {
/* set read buffer back to draw buffer (in case of logicops) */
(*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
ctx->Color.DriverDrawBuffer );
}
if (shift_or_offset) {
_mesa_shift_and_offset_ci( ctx, width, indexes );
}
if (ctx->Pixel.MapColorFlag) {
_mesa_map_ci( ctx, width, indexes );
}
if (zoom) {
gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
}
else {
gl_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
}
}
/* Restore pixel source to be the draw buffer (for blending, etc) */
(*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
ctx->Color.DriverDrawBuffer );
if (overlapping)
FREE(tmpImage);
}
/*
* TODO: Optimize!!!!
*/
static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLfloat depth[MAX_WIDTH];
GLdepth zspan[MAX_WIDTH];
GLfloat *p, *tmpImage;
GLuint indexes[MAX_WIDTH];
GLchan rgba[MAX_WIDTH][4];
GLint sy, dy, stepy;
GLint i, j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
if (!ctx->ReadBuffer->DepthBuffer || !ctx->DrawBuffer->DepthBuffer) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
return;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
/* setup colors or indexes */
if (ctx->Visual.RGBAflag) {
GLuint *rgba32 = (GLuint *) rgba;
GLuint color = *(GLuint*)( ctx->Current.Color );
for (i = 0; i < width; i++) {
rgba32[i] = color;
}
}
else {
for (i = 0; i < width; i++) {
indexes[i] = ctx->Current.Index;
}
}
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
if (!tmpImage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_mesa_read_depth_span_float(ctx, width, srcx, ssy, p);
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
if (overlapping) {
MEMCPY(depth, p, width * sizeof(GLfloat));
p += width;
}
else {
_mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
}
for (i = 0; i < width; i++) {
GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->Visual.DepthMax);
}
if (ctx->Visual.RGBAflag) {
if (zoom) {
gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
(const GLchan (*)[4])rgba, desty );
}
else {
gl_write_rgba_span( ctx, width, destx, dy, zspan, 0,
rgba, GL_BITMAP);
}
}
else {
if (zoom) {
gl_write_zoomed_index_span( ctx, width, destx, dy,
zspan, 0, indexes, desty );
}
else {
gl_write_index_span( ctx, width, destx, dy,
zspan, 0, indexes, GL_BITMAP );
}
}
}
if (overlapping)
FREE(tmpImage);
}
static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLint sy, dy, stepy;
GLint j;
GLstencil *p, *tmpImage;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
GLint overlapping;
if (!ctx->DrawBuffer->Stencil || !ctx->ReadBuffer->Stencil) {
gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
return;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
if (!tmpImage) {
gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_mesa_read_stencil_span( ctx, width, srcx, ssy, p );
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
GLstencil stencil[MAX_WIDTH];
if (overlapping) {
MEMCPY(stencil, p, width * sizeof(GLstencil));
p += width;
}
else {
_mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
}
if (shift_or_offset) {
_mesa_shift_and_offset_stencil( ctx, width, stencil );
}
if (ctx->Pixel.MapStencilFlag) {
_mesa_map_stencil( ctx, width, stencil );
}
if (zoom) {
gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
}
else {
_mesa_write_stencil_span( ctx, width, destx, dy, stencil );
}
}
if (overlapping)
FREE(tmpImage);
}
void
_swrast_CopyPixels( GLcontext *ctx,
GLint srcx, GLint srcy, GLsizei width, GLsizei height,
GLint destx, GLint desty,
GLenum type )
{
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
if (type == GL_COLOR && ctx->Visual.RGBAflag) {
copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type == GL_COLOR && !ctx->Visual.RGBAflag) {
copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type == GL_DEPTH) {
copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else if (type == GL_STENCIL) {
copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
}
else {
gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
}
}